Servo electric screwdriver torque automatic calibration system and calibration method

Abstract

The invention discloses an automatic torque calibration system and method for a servo electric screwdriver. The method comprises the steps that an upper computer sets calibration torque Tr and sets the numerical value of current I, and a controller controls the electric screwdriver to lock a screw under the condition of the current I; the torsion detector detects the torsion value of the electric screwdriver to obtain a torsion peak value Tf, and compares the torsion peak value Tf with the calibrated torsion Tr; and the upper computer outputs comparison results, and when the comparison results are the same, the current I is the calibration current. The working current value of the electric screwdriver is set through the upper computer, the controller controls the electric screwdriver to lock screws under the condition of the working current value, and the torsion detector detects the torsion peak value in the locking process and compares the torsion peak value with the calibration torsion set by the upper computer so as to achieve the purpose of confirming the calibration current of the electric screwdriver. Therefore, automatic calibration of the torsion of the electric screwdriver is realized, and the workload of manual calibration can be reduced; in addition, inconsistency of calibration data caused by the fact that the mode and the force of holding the electric screwdriver by hand cannot be guaranteed in manual calibration can be avoided.

Description

Technical Field

[0001] The invention relates to the field of electric assembly tools, and in particular to an automatic torque calibration system and a calibration method for a servo electric screwdriver. Background Art

[0002] With the needs of digital and intelligent production, factories are currently putting forward higher and higher requirements for screw locking tools, among which ensuring the accuracy of tool locking torque is one of the most important indicators; the servo electric screwdriver uses a servo motor plus a transmission mechanism, and controls the output current of the servo motor to achieve control of the output locking torque. Due to the inconsistency of the transmission mechanism of each servo electric screwdriver, it is impossible to guarantee that each electric screwdriver will output the same torque under the same output current. In order to ensure that each electric screwdriver can ensure the accuracy of the output torque, it is required that each electric screwdriver must be calibrated separately, where calibration is the correspondence between calibration current and torque.

[0003] However, the traditional calibration method is for workers to manually calibrate the correspondence between current and torque; this method wastes a lot of manpower, and because the way and strength of the workers holding the electric screwdriver during the calibration process cannot be guaranteed, the calibrated electric screwdriver will have certain deviations. Summary of the invention

[0004] The object of the present invention is to provide a servo electric screwdriver torque automatic calibration system and calibration method to solve the problems raised in the above background technology.

[0005] In order to achieve the above objectives, the technical solution adopted by the present invention is:

[0006] A servo electric screwdriver torque automatic calibration system includes a host computer, a controller, a torque detector and an electric screwdriver, wherein:

[0007] The host computer has a human-computer interactive graphical interface, which is divided into a data display interface and a status display interface. The data display interface is mainly used to transmit the working current value of the electric screwdriver to the controller, and at the same time receive the peak value of the electric screwdriver output torque transmitted by the controller, and compare the peak value of the electric screwdriver output torque with the calibrated torque value, and display the working current value of the electric screwdriver and the calibrated torque value on the graphical interface. The status display interface is mainly used to monitor the calibration state and determine whether the calibration is successful;

[0008] The controller is mainly used to receive the working current value of the electric screwdriver, and control the electric screwdriver to work under the working current condition of the electric screwdriver, and at the same time transmit the peak value of the output torque of the electric screwdriver to the host computer;

[0009] The electric screwdriver is mainly used to tighten the screws under the corresponding working current of the electric screwdriver;

[0010] The torque detector is mainly used to detect the output torque of the electric screwdriver and transmit the torque peak value to the controller.

[0011] Preferably, the automatic calibration system further comprises a fixing frame slidably connected to the electric screwdriver, the fixing frame is mounted on an operating table, and a torque detector is mounted on the operating table.

[0012] Preferably, a transmission plate is provided on the top of the torque detector, and the transmission plate is provided with threaded holes matching the screws.

[0013] Preferably, the data display interface includes a calibration torque data setting interface and a calibration current data setting interface, and the status display interface is provided with an automatic marking operation status light, an electric screwdriver lifting reminder light, an automatic calibration success display light and an automatic calibration failure warning light.

[0014] Preferably, the calibration current data setting interface is connected to the input end of the controller in the form of communication, and the automatic marking operation status light, the electric screwdriver lifting prompt light, the automatic calibration success display light and the automatic calibration failure warning light are all connected to the output end of the controller in the form of communication.

[0015] A method for automatically calibrating torque of a servo electric screwdriver comprises the following steps:

[0016] S1: Preparation: Lower the electric screwdriver along the fixing frame until the screw head is threaded into the threaded hole, and connect the controller to the upper computer, torque tester and electric screwdriver through wires, and connect the torque tester to the electric screwdriver through wires;

[0017] S2: Connect the host computer, controller, torque tester and electric screwdriver to power, the host computer sets the calibration torque Tr in the calibration torque data interface, sets the calibration current value to the current I value in the calibration current data interface, and sends a locking instruction to the controller in the form of communication. The controller controls the electric screwdriver to lock the screw under the current I condition according to the locking instruction;

[0018] S3: During the locking process, the torque detector detects the torque of the electric screwdriver. After locking, the torque detector transmits the detected torque peak value Tf to the controller in the form of a signal. The controller converts the torque peak value Tf signal into torque peak value Tf data and transmits it to the host computer in the form of communication. The host computer compares the torque peak value Tf with the calibrated torque Tr and outputs the comparison result.

[0019] S4: If the torque peak value Tf in step 3 is different from the calibrated torque Tr, the host computer resets the current I value in the calibration current data interface, and sends a locking instruction to the controller in the form of communication. The controller controls the electric screwdriver to lock the screw under the current I condition according to the locking instruction. After locking, the torque detector transmits the detected torque peak value Tf to the controller in the form of a signal. The controller converts the torque peak value Tf signal into data and transmits it to the host computer in the form of communication. The host computer compares the torque peak value Tf with the calibrated torque Tr.

[0020] S5: Repeat step 4 until the torque peak Tf is the same as the calibration torque Tr. The calibration is successful. At this time, the current I set by the host computer is the calibration current, and the calibration current value is saved to the batch control.

[0021] S6: Raise the electric screwdriver along the fixing frame until it is completely separated from the screw head, and cut off the connection between the host computer, controller, torque tester, electric screwdriver and power supply.

[0022] Preferably, the screw locking in step S2 includes tightening the screw in a positive direction and loosening the screw in a reverse direction.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the servo electric screwdriver torque automatic calibration system and calibration method provided by the present invention, the working current value of the electric screwdriver is set by the host computer, the controller controls the electric screwdriver to lock the screws under the working current value condition, the torque detector detects the torque peak value during the locking process, and compares the torque peak value with the calibration torque set by the host computer to achieve the purpose of confirming the calibration current of the electric screwdriver, thereby realizing the automatic calibration of the torque of the electric screwdriver, which can reduce the workload of manual calibration; and can avoid manual calibration, because the way and strength of holding the electric screwdriver cannot be guaranteed, resulting in inconsistency of calibration data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A structural diagram of a servo electric screwdriver torque automatic calibration system provided in an embodiment of the present invention.

[0025] Figure 2 A schematic diagram of a host computer graphical interface of a servo electric screwdriver torque automatic calibration system provided in an embodiment of the present invention.

[0026] Figure 3 A schematic diagram of the installation of an electric screwdriver of a servo electric screwdriver torque automatic calibration system provided in an embodiment of the present invention.

[0027] Figure 4 A schematic flow chart of a method for automatic torque calibration of a servo electric screwdriver provided in an embodiment of the present invention.

[0028] Figure 5 An automatic calibration flow chart of an automatic calibration system for a servo electric screwdriver torque provided in an embodiment of the present invention.

[0029] The accompanying drawings are marked as follows: host computer 1, controller 2, torque tester 3, electric screwdriver 4, data display interface 5, calibration torque data setting interface 501, calibration current data setting interface 502, status display interface 6, screw 7, automatic marking operation status light 601, electric screwdriver lifting prompt light 602, automatic calibration success display light 603, automatic calibration failure warning light 604, fixing bracket 8, operating table 9, transfer plate 10. DETAILED DESCRIPTION

[0030] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings to make the technical solutions and beneficial effects of the present invention clearer and more specific.

[0031] like Figures 1 to 3 As shown, the present embodiment provides a servo electric screwdriver torque automatic calibration system, including a host computer 1, a controller 2, a torque detector 3 and an electric screwdriver 4, wherein the host computer 1 has a human-computer interactive graphical interface, the graphical interface is divided into a data display interface 5 and a status display interface 6, the data display interface 5 is mainly used to transmit the working current value of the electric screwdriver 4 to the controller 2, and at the same time receive the output torque peak value of the electric screwdriver 4 transmitted by the controller 2, and compare the output torque peak value of the electric screwdriver 4 with the calibrated torque value, and display the working current value and the calibrated torque value of the electric screwdriver 4 on the graphical interface, and the status display interface 6 is mainly used to monitor Calibration status and judgment whether the calibration is successful; the controller 2 is mainly used to receive the working current value of the electric screwdriver 4, and control the electric screwdriver 4 to work under the working current condition of the electric screwdriver 4, and transmit the peak value of the output torque of the electric screwdriver 4 to the upper computer 1, so as to realize the control of the operation of the electric screwdriver 4 during automatic calibration, including automatic adjustment of the working current of the electric screwdriver 4, and realize the data collection of the peak value of the output torque of the electric screwdriver 4; the electric screwdriver 4 is mainly used to lock the screw 7 under the corresponding working current condition of the electric screwdriver 4 to realize the torque output; the torque detector 3 is mainly used to detect the output torque of the electric screwdriver 4, and transmit the peak value of the torque to the controller 2.

[0032] In this embodiment, Figure 3 As shown, it also includes a fixing frame 8 that is slidably connected to the electric screwdriver 4. The fixing frame 8 is installed on an operating table 9, and the torque detector 3 is installed on the operating table 9.

[0033] Specifically, the electric screwdriver 4 is slidably connected to the operating table 9 so that it can move up and down above the threaded hole to lock the inner screw 7 thereof.

[0034] In this embodiment, Figure 3 As shown, a transmission plate 10 is arranged on the top of the torque detector 3 , and a threaded hole matching the screw 7 is opened on the transmission plate 10 .

[0035] Specifically, the electric screwdriver 4 transmits the torque to the torque detector 3 through the transmission plate 10 to realize the detection of the torque detector 3.

[0036] In this embodiment, Figure 2 As shown, the data display interface 5 includes a calibration torque data setting interface 501 and a calibration current data setting interface 502, and the status display interface 6 is provided with an automatic marking operation status light 601, an electric screwdriver lifting prompt light 602, an automatic calibration success display light 603 and an automatic calibration failure warning light 604.

[0037] Specifically, the calibration torque data setting interface 501 is used to set the calibration torque as a comparison value; the calibration current data setting interface 502 is used to set the working current of the torque detector 3 to obtain the batch output torque peak value for comparison with the calibration torque; the automatic marking operation status light 601 displays whether the automatic marking is in progress; the electric screwdriver lifting prompt light 602 displays the position of the electric screwdriver 4 and whether it is detached from the screw 7; the automatic calibration success display light 603 and the automatic calibration failure warning light 604 display whether the automatic calibration is successful.

[0038] In this embodiment, the calibration current data setting interface 502 is connected to the input end of the controller 2 in the form of communication, and the automatic marking operation status light 601, the electric screwdriver lifting prompt light 602, the automatic calibration success display light 603 and the automatic calibration failure warning light 604 are all connected to the output end of the controller 2 in the form of communication.

[0039] like Figure 4 and Figure 5 As shown, this embodiment provides a method for automatic calibration of torque of a servo electric screwdriver, comprising the following steps:

[0040] S1: lower the electric screwdriver 2 along the fixing frame 8 until it is connected with the head of the screw 7 threaded in the threaded hole, and connect the controller 2 with the host computer 1, the torque detector 3 and the electric screwdriver 4 respectively through wires, and connect the torque detector 3 with the electric screwdriver 4 through wires;

[0041] S2: Connect the host computer 1, the controller 2, the torque detector 3 and the electric screwdriver 4 to the power supply. The host computer 1 sets the calibration torque Tr in the calibration torque data interface, sets the calibration current value to the current I value in the calibration current data interface, and sends a locking instruction to the controller 2 in the form of communication. The controller 2 controls the electric screwdriver 4 to lock the screw 7 under the condition of current I according to the locking instruction.

[0042] S3: During the locking process, the torque detector 3 detects the torque of the electric screwdriver 4. After locking, the torque detector 3 transmits the detected torque peak value Tf to the controller 2 in the form of a signal. The controller 2 converts the torque peak value Tf signal into torque peak value Tf data and transmits it to the host computer 1 in the form of communication. The host computer 1 compares the torque peak value Tf with the calibrated torque Tr and outputs the comparison result.

[0043] S4: If the torque peak value Tf in step 3 is different from the calibrated torque Tr, the host computer 1 resets the current I value in the calibration current data interface, and sends a locking instruction to the controller 2 in the form of communication. The controller 2 controls the electric screwdriver 4 to lock the screw 7 under the current I condition according to the locking instruction. After locking, the torque detector 3 transmits the detected torque peak value Tf to the controller 2 in the form of a signal. The controller 2 converts the torque peak value Tf signal into data and transmits it to the host computer 1 in the form of communication. The host computer 1 compares the torque peak value Tf with the calibrated torque Tr and outputs the comparison result.

[0044] S5: Repeat step S4 until the torque peak value Tf is the same as the calibration torque Tr, and the calibration is successful. At this time, the current I set by the host computer 1 is the calibration current, and the calibration current value is saved to the electric batch 4.

[0045] S6: Raise the electric screwdriver 4 along the fixing frame 8 until it is completely separated from the head of the screw 7, and cut off the connection between the host computer 1, the controller 2, the torque detector 3, and the electric screwdriver 4 and the power supply.

[0046] In this embodiment, the locking of the screw 7 in step S2 includes tightening the screw 7 in a positive direction and loosening the screw 7 in a reverse direction.

[0047] Specifically, in step S2, the electric screwdriver 4 first loosens the screw 7 threadedly connected to the threaded hole in the reverse direction, and then tightens the screw 7 in the forward direction to lock the screw 7.

[0048] The above description is only a preferred specific implementation manner of this embodiment, but the protection scope of this embodiment is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of this embodiment within the technical scope disclosed in this embodiment, and they should be covered by the protection scope of this embodiment.

Claims

1. A servo electric screwdriver torque automatic calibration system, It is characterized in that It includes host computer, controller, torque detector and electric screwdriver, among which: The host computer has a human-computer interactive graphical interface, which is divided into a data display interface and a status display interface. The data display interface is mainly used to transmit the working current value of the electric screwdriver to the controller, and at the same time receive the peak value of the electric screwdriver output torque transmitted by the controller, and compare the peak value of the electric screwdriver output torque with the calibrated torque value, and display the working current value of the electric screwdriver and the calibrated torque value on the graphical interface. The status display interface is mainly used to monitor the calibration state and determine whether the calibration is successful; The controller is mainly used to receive the working current value of the electric screwdriver, and control the electric screwdriver to work under the working current condition of the electric screwdriver, and at the same time transmit the peak value of the output torque of the electric screwdriver to the host computer; The electric screwdriver is mainly used to tighten the screws under the corresponding working current of the electric screwdriver; The torque detector is mainly used to detect the output torque of the electric screwdriver and transmit the torque peak value to the controller.

2. According to claim 1, a servo electric screwdriver torque automatic calibration system, It is characterized in that The automatic calibration system also includes a fixing frame slidably connected to the electric screwdriver, the fixing frame is installed on an operating table, and a torque detector is installed on the operating table.

3. According to claim 1, a servo electric screwdriver torque automatic calibration system, It is characterized in that A transmission plate is arranged on the top of the torque detector, and threaded holes matching with the screws are opened on the transmission plate.

4. According to claim 1, a servo electric screwdriver torque automatic calibration system, It is characterized in that The data display interface includes a calibration torque data setting interface and a calibration current data setting interface, and the status display interface is provided with an automatic marking operation status light, a screwdriver lifting prompt light, an automatic calibration success display light, and an automatic calibration failure warning light.

5. According to claim 1, a servo electric screwdriver torque automatic calibration system, It is characterized in that The calibration current data setting interface is connected to the input end of the controller in the form of communication, and the automatic marking operation status light, the electric screwdriver lifting prompt light, the automatic calibration success display light and the automatic calibration failure warning light are all connected to the output end of the controller in the form of communication.

6. A method for automatic calibration of torque of a servo electric screwdriver. It is characterized in that The following steps are involved: S1: Lower the electric screwdriver along the fixing frame until it is connected to the screw head that is threaded into the threaded hole, and connect the controller to the host computer, the torque tester and the electric screwdriver through wires, and connect the torque tester to the electric screwdriver through wires; S2: Connect the host computer, controller, torque tester and electric screwdriver to power, the host computer sets the calibration torque Tr in the calibration torque data interface, sets the calibration current value to the current I value in the calibration current data interface, and sends a locking instruction to the controller in the form of communication. The controller controls the electric screwdriver to lock the screw under the current I condition according to the locking instruction; S3: During the locking process, the torque detector detects the torque of the electric screwdriver. After locking, the torque detector transmits the detected torque peak value Tf to the controller in the form of a signal. The controller converts the torque peak value Tf signal into torque peak value Tf data and transmits it to the host computer in the form of communication. The host computer compares the torque peak value Tf with the calibrated torque Tr and outputs the comparison result. S4: If the torque peak value Tf in step 3 is different from the calibrated torque Tr, the host computer resets the current I value in the calibration current data interface, and sends a locking instruction to the controller in the form of communication. The controller controls the electric screwdriver to lock the screw under the current I condition according to the locking instruction. After locking, the torque detector transmits the detected torque peak value Tf to the controller in the form of a signal. The controller converts the torque peak value Tf signal into data and transmits it to the host computer in the form of communication. The host computer compares the torque peak value Tf with the calibrated torque Tr and outputs the comparison result. S5: Repeat step 4 until the torque peak Tf is the same as the calibration torque Tr. The calibration is successful. At this time, the current I set by the host computer is the calibration current, and the calibration current value is saved to the batch control. S6: Raise the electric screwdriver along the fixing frame until it is completely separated from the screw head, and cut off the connection between the host computer, controller, torque tester, electric screwdriver and power supply.

7. A method for automatically calibrating torque of a servo electric screwdriver according to claim 1, It is characterized in that In the step S2, the screw locking includes tightening the screw in the forward direction and loosening the screw in the reverse direction.

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